My girlfriend is taking piano lessons. Her music teacher (Ms. Kuroishima) is elegant, beautiful, and kind. Lately, things haven't been going well between us. She won't even have sex with me. In the midst of this, Ms. Kuroishima, who is even prettier than my girlfriend, appears before me. I ask her to teach me piano too. She teaches me while leaning against me from behind, touching my hand. Ms. Kuroishima looks like she'd give in if I pushed her, and I can't help but rub her breasts from behind... "This isn't good... It's not right... Ahhh..." Her troubled expression tickles my libido.